You know how easy that is to get hold of for the user and for the isp if they wanted? Just capturing a few packets will reveal the dns, username and password since each channel has that. So they are just telling you that it's sensitive and you're falling for it and being locked into the horrible apps.
You really think your isp doesn't already see you connecting to a server and streaming for hours on end? Even with a vpn all it takes is some deep packet inspection and your isp know that video is being streamed since video streaming has specific bandwidth requirements, combine this with streaming during a match and it's very simple to connect the dots that a match is being steamed. Once they know or suspect specific types of data it's being streamed they could even slow traffic to specific servers.
This is not some new technology either, been happening for years. Article from 2006 and another one that talks more about the techniques.
Carriers Inspect IPTV More Closely
What is Deep Packet Inspection? (And How it Really Works)
I think you're being very naive if you think suppliers are actually being protected by a custom app. It's a ploy by suppliers to force their apps, make it harder for the customer to have any control, lock them in for longer periods because all their settings, favorites are in the dedicated app. I don't need to ask any suppliers anything, you can continue using the dodgy apps they provide and I'll stick with Tivimate.